Heat dissipating device

ABSTRACT

A heat dissipating device includes a carrier, a magnetic driving module installed on the carrier, two fixing rivets, and two swing structures. Each of the swing structures includes a blade, a positioning rivet, and a magnetic actuation fixed on the blade by using the positioning rivet. The two blades are respectively fixed on two opposite outer sides of the carrier by using the two fixing rivets, and the two blades are parallel to each other. When the magnetic driving module generates a magnetic field, the two magnetic actuations are moved by the magnetic field to swing the two blades.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The instant invention relates to a heat dissipating device; inparticular, to a heat dissipating device using swing blades.

2. Description of Related Art

The present inventor has previously provided a heat dissipating device(i.e., Taiwan Patent Publication No. 1519758) which can rapidlydissipate heat by swing blades thereof. Improving on the heatdissipating device for automated and large-scale production is one ofthe inventor's major concerns.

SUMMARY OF THE INVENTION

The instant disclosure provides a heat dissipating device, which can bemass produced with automated equipment.

The instant disclosure provides a heat dissipating device including acarrier, a magnetic driving module installed to the carrier, two swingstructures fastened to the carrier, and two fixing rivets. The magneticdriving module is configured to generate a magnetic field, and themagnetic field defines two magnetic areas respectively having twoopposite magnetisms. The magnetic driving module is configured tocyclically change the magnetisms of the two magnetic areas by receivinga periodic power. Each of the two swing structures includes a blade, apositioning rivet, and a magnetic actuation. The blade has a mountingportion and a free end portion. The magnetic actuation is fixed on aportion of the blade by using the positioning rivet, and the portion ofthe blade is arranged between the mounting portion and the free endportion. The two fixing rivets respectively fix the mounting portions ofthe two blades to two opposite outer sides of the carrier. The twoblades are parallel to each other, and the two magnetic actuations arerespectively arranged in the two magnetic areas. When the magneticdriving module generates the magnetic field, the two magnetic actuationsare moved by the two magnetic areas to swing the free end portions ofthe two blades.

In summary, the heat dissipating device of the instant disclosure adaptsthe positioning rivets to fix the magnetic actuations onto the bladesand adapts the fixing rivets to fix the blades onto the carrier, so thatthe structure of the heat dissipating device can be easily mass producedwith automated equipment.

In order to further appreciate the characteristics and technicalcontents of the instant invention, references are hereunder made to thedetailed descriptions and appended drawings in connection with theinstant invention. However, the appended drawings are merely shown forexemplary purposes, and should not be construed as restricting the scopeof the instant invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing an embodiment of a heat dissipatingdevice according to the instant disclosure;

FIG. 2 is a perspective view of FIG. 1 from another perspective;

FIG. 3 is an exploded perspective view of FIG. 1;

FIG. 4 is a front view of FIG. 1;

FIG. 5 is a cross-sectional view along a cross-sectional line V-V ofFIG. 1;

FIG. 6 is a cross-sectional view along a cross-sectional line VI-VI ofFIG. 1;

FIG. 7 is a cross-sectional view showing the cross-section V II of FIG.6;

FIG. 8 is a front view showing the embodiment of the heat dissipatingdevice in a first operation mode;

FIG. 9 is a front view showing the embodiment of the heat dissipatingdevice in a second operation mode; and

FIGS. 10-14 are schematic views each showing a swing structure of theheat dissipating device according to other embodiments of the instantdisclosure.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

References are hereunder made to the detailed descriptions and appendeddrawings in connection with the instant invention. However, the appendeddrawings are merely provided for exemplary purposes, and should not beconstrued as restricting the scope of the instant invention.

Reference is first made to FIGS. 1 to 9, which show an embodiment of theinstant disclosure. As shown in FIGS. 1 and 2, the instant embodimentdiscloses a heat dissipating device 100 that includes a carrier 1, amagnetic driving module 2, two swing structures 3, and a plurality offixing rivets 4. The magnetic driving module 2 is installed to thecarrier 1. The two swing structures 3 are fastened to the carrier 1 byusing the fixing rivets 4 and correspond in position to the magneticdriving module 2. The number of the fixing rivets 4 in the instantembodiment is four, but is not limited thereto. For example, the numberof the fixing rivets 4 may be two for respectively fixing the two swingstructures 3 onto the carrier 1.

As shown in FIGS. 3 through 7, the carrier 1 is suitable to be formed byinsert molding. The carrier 1 includes two bases 11 and a tube-likeconnecting portion 12 (as shown in FIG. 5) connecting the two bases 11.The two bases 11 in the instant embodiment are in a mirror symmetricalarrangement with respect to the connecting portion 12. As the two bases11 in the instant embodiment are of the same structure, the followingdescription discloses the structure of just one of the two bases 11 forthe sake of brevity. The base 11 includes an inner surface 111, an outersurface 112 opposing to the inner surface 111, and two opposite endsurfaces 113. The inner surface 111 is connected to the connectingportion 12. The base 11 has a positioning trough 114 formed on the outersurface 112. The two end surfaces 113 are of the same shape. At leastone fixing hole 115 is recessed in at least one of the two end surfaces113, such that the carrier 1 can be fixed onto an external object (notshown) by extending a screw (not shown) through the fixing hole 115 andinto the external object. Moreover, the fixing hole 115 can be a blindhole or a thru-hole.

In other words, two opposite ends of the connecting portion 12 arerespectively connected to the inner surfaces 111 of the two bases 11.The positioning troughs 114 of the two bases 11 are respectively formedon the two outer surfaces 112 of the carrier 1. Specifically, in each ofthe two bases 11, the positioning trough 114 includes a bottom flange1141 formed on a bottom edge of the outer surface 112, and two sideflanges 1142 respectively formed on two opposite side edges of the outersurface 112. The bottom flange 1141 and the two side flanges 1142 ofeach of the two bases 11 are in a U-shape.

However, the structure of the positioning trough 114 is not limited tothe above description. For example, as shown in FIG. 10, in each of thetwo bases 11, the positioning trough 114 includes a bottom flange 1141formed on a bottom edge of the outer surface 112, and a side flange 1142formed on a side edge of the outer surface 112. The bottom flange 1141and the side flange 1142 of each of the two bases 11 are in an L-shape.

The magnetic driving module 2 is configured to generate a magnetic field(not shown). The magnetic field defines two magnetic areas (i.e., a leftarea and a right area of the magnetic driving module 2 as shown in FIG.4) respectively having two opposite magnetisms. The magnetic drivingmodule 2 is configured to cyclically change the magnetisms of the twomagnetic areas by receiving a periodic power (not shown). The periodicpower can be periodic square waves, periodic triangle waves, periodicsine waves, or the positive and negative half-cycle period ofalternating currents. The periodic power exemplified in the instantembodiment is the positive and negative half-cycle period of alternatingcurrents.

Specifically, the magnetic driving module 2 in the instant embodimentincludes an elongated core 21 (i.e., iron core) and a coil 22. The core21 couples into the connecting portion 12 of the carrier 1 in atight-fitting connection, and the coil 22 is wound around an outer sideof the connecting portion 12 of the carrier 1. The coil 22 iselectrically connected to the periodic power. When the periodic poweremits a current to travel in the coil 22, the coil 22 and the core 21generate the magnetic field, and the magnetisms of the two magneticareas are cyclically changed with time.

As the two swing structures 3 in the instant embodiment are of the samestructure, the following description discloses just one of the two swingstructures 3 for the sake of brevity. The swing structure 3 includes anelongated blade 31, a positioning rivet 32, and a magnetic actuation 33fixed on the blade 31 by using the positioning rivet 32. The blade 31has a rectangular shape and may be a glass-fiber blade or a polyesterblade. The blade 31 includes a mounting portion 311 and a free endportion 312 respectively arranged on two opposite portions thereof. Themagnetic actuation 33 is fixed on a portion of the blade 31 arrangedbetween the mounting portion 311 and the free end portion 312.Specifically, the magnetic actuation 33 in the instant embodiment hastwo magnets 331 respectively disposed on two opposite surfaces of theblade 31, but the magnetic actuation 33 in another embodiment (notshown) of the instant disclosure can be a single magnet 331. Thepositioning rivet 32 is made of plastic or metal and includes a shaftportion 321 and two abutting portions 322. The two abutting portions 322are respectively and integrally connected to two opposite ends of theshaft portion 321. An outside diameter of each of the abutting portions322 is larger than that of the shaft portions 321. The shaft portion 321is inserted into the blade 31 and the two magnets 331, and the twoabutting portions 322 are respectively abutted against outer surfaces ofthe two magnets 331. Moreover, the shaft portion 321 and the twoabutting portions 322 of the positioning rivet 32 in the instantembodiment each has a hollow structure, but the shaft portion 321 andthe two abutting portions 322 of the positioning rivet 32 in the otherembodiment (not shown) each can be of a solid structure.

The mounting portions 311 of the two blades 31 are respectivelypositioned in the two positioning troughs 114, and a bottom edge of eachof the two blades 31 is abutted against the bottom flange 1141 of thecorresponding positioning trough 114. Accordingly, the blade 31 does notprotrude from a bottom surface of the corresponding base 11, so as tosimplify the assembling process of the heat dissipating device 100.Moreover, the fixing rivets 4 are used to respectively fasten themounting portions 311 of the two blades 31 onto two outer surfaces 112of the carrier 1, such that the two blades 31 are in a parallelarrangement and the two magnetic actuations 33 are respectively arrangedin the two magnetic areas.

Specifically, each of the fixing rivets 4 is made of plastic or metaland includes a shaft portion 41 and two abutting portions 42. In each ofthe fixing rivets 4, the two abutting portions 42 are respectively andintegrally connected to two opposite ends of the shaft portion 41. Anoutside diameter of each of the abutting portions 42 is larger than thatof the shaft portions 41. In the instant embodiment, the shaft portion41 and the two abutting portions 42 of each of the fixing rivets 4 eachhas a hollow structure, but the shaft portion 41 and the two abuttingportions 42 of each of the fixing rivets 4 in another embodiment (notshown) of the instant disclosure each can be of a solid structure.

Moreover, the shaft portions 41 of the two fixing rivets 4 arerespectively inserted into the mounting portions 311 of the two blades31 and are respectively inserted into the two bases 11, and the twoabutting portions 42 of each of the fixing rivets 4 are respectivelyabutted against the mounting portion 311 of the corresponding blade 31and the inner surface 111 of the corresponding base 11. One of the twoabutting portions 42 of each of the two fixing rivets 4 abutted againstthe mounting portion 311 of the corresponding blade 21 is arranged inthe positioning trough 114 of the corresponding base 11. Accordingly,each of the abutting portions 42 does not protrude from the positioningtrough 114 of the corresponding base 11, so as to simplify theassembling process of the heat dissipating device 100.

When the magnetic driving module 2 generates the magnetic field, the twomagnetic actuations 33 are moved by the two magnetic areas to swing thefree end portions 312 of the two blades 31. The two blades 31 of theheat dissipating device 100 can swing in the same direction (as shown inFIG. 8) or in an opposite direction (as shown in FIG. 9).

In addition, the swing structure 3 of the instant disclosure can bechanged according to practical needs and is not limited to that shown inthe figures. For example, in each of the two swing structures 3 as shownin FIGS. 10 through 13, the magnetic actuation 33 includes at least onemagnet 331 and at least one buffering pad 332 abutted against the blade31. The at least one magnet 331 and the at least one buffering pad 332are fixed on the blade 31 by the positioning rivet 32.

Specifically, as shown in FIG. 10, the magnetic actuation 33 includes amagnet 331 and a buffering pad 332 sandwiched between the magnet 331 andthe blade 31. The magnet 331 and the buffering pad 332 are fastened tothe blade 31 by the positioning rivet 32.

As shown in FIG. 11, the magnetic actuation 33 includes two magnets 331and two buffering pads 332 respectively disposed on two oppositesurfaces of the blade 31. The two magnets 331 are respectively disposedon the two buffering pads 332, and the magnets 331 and the bufferingpads 332 are fastened to the blade 31 by the positioning rivet 32.

As shown in FIG. 12, the magnetic actuation 33 includes a magnet 331 anda buffering pad 332 both respectively disposed on two opposite surfacesof the blade 31. The magnet 331 and the buffering pad 332 are fastenedto the blade 31 by the positioning rivet 32.

As shown in FIG. 13, the magnetic actuation 33 includes two magnets 331respectively disposed on two opposite surfaces of the blade 31 and twobuffering pads 332 respectively disposed on the magnets 331. The magnets331 and the buffering pads 332 are fastened to the blade 31 by thepositioning rivet 32.

[The Effect of the Instant Disclosure]

In summary, the heat dissipating device of the instant disclosure adaptsthe positioning rivets to fix the magnetic actuations onto the bladesand adapts the fixing rivets to fix the blades onto the carrier, so thatthe structure of the heat dissipating device can be easily mass producedwith automated equipment.

Moreover, the mounting portions of the two blades are respectivelypositioned in the two positioning troughs, and one of the abuttingportions of each of the fixing rivets abutted against the mountingportion of the corresponding blade is arranged in the positioning troughof the corresponding base, so that the blades do not protrude from thebottom surface of the bases and each of the abutting portions does notprotrude from the positioning trough of the corresponding base. Thus,the assembling process of the heat dissipating device is also madeeasier.

The descriptions illustrated supra set forth simply the preferredembodiments of the instant invention; however, the characteristics ofthe instant invention are by no means restricted thereto. All changes,alterations, or modifications conveniently considered by those skilledin the art are deemed to be encompassed within the scope of the instantinvention delineated by the following claims.

What is claimed is:
 1. A heat dissipating device, comprising: a carrier;a magnetic driving module installed to the carrier, wherein the magneticdriving module is configured to generate a magnetic field, the magneticfield defining two magnetic areas respectively having two oppositemagnetisms, and the magnetic driving module being configured tocyclically change the magnetisms of the two magnetic areas by receivinga periodic power; two swing structures fastened to the carrier, each ofthe two swing structures comprising: a blade having a mounting portionand a free end portion; a positioning rivet; and a magnetic actuationfixed on a portion of the blade by using the positioning rivet, whereinthe portion of the blade is arranged between the mounting portion andthe free end portion; and two fixing rivets respectively fixing themounting portions of the two blades to two opposite outer sides of thecarrier, wherein the two blades are parallel to each other, and the twomagnetic actuations are respectively arranged in the two magnetic areas,and wherein when the magnetic driving module generates the magneticfield, the two magnetic actuations are moved by the two magnetic areasto swing the free end portions of the two blades.
 2. The heatdissipating device as claimed in claim 1, wherein the carrier has twopositioning troughs, and the mounting portions of the two blades arerespectively positioned in the two positioning troughs.
 3. The heatdissipating device as claimed in claim 2, wherein the carrier includestwo bases and a connecting portion connecting the two bases, the twobases being in a mirror symmetrical arrangement with respect to theconnecting portion, and wherein each of the two bases has an innersurface and an outer surface, two opposite ends of the connectingportion are respectively connected to the inner surfaces of the twobases, and the two positioning troughs are respectively formed on theouter surfaces of the two bases.
 4. The heat dissipating device asclaimed in claim 3, wherein each of the two fixing rivets includes ashaft portion and two abutting portions respectively and integrallyconnected to two opposite ends of the shaft portion, and an outsidediameter of each of the abutting portions is larger than that of each ofthe shaft portions, and wherein the shaft portions of the two fixingrivets are respectively inserted into the mounting portions of the twoblades and are respectively inserted into the two bases, and the twoabutting portions of each of the fixing rivets are respectively abuttedagainst the mounting portion of the corresponding blade and the innersurface of the corresponding base.
 5. The heat dissipating device asclaimed in claim 4, wherein one of the two abutting portions of each ofthe two fixing rivets abutted against the mounting portion of thecorresponding blade is arranged in the positioning trough of thecorresponding base.
 6. The heat dissipating device as claimed in claim1, wherein in each of the two swing structures, the magnetic actuationincludes at least one magnet and at least one buffering pad abuttedagainst the blade, and the at least one magnet and the at least onebuffering pad are fixed on the blade by the positioning rivet.
 7. Theheat dissipating device as claimed in claim 3, wherein each of the twobases has two opposite end surfaces, and at least one fixing hole isrecessed in at least one of the two end surfaces of each of the twobases.
 8. The heat dissipating device as claimed in claim 3, wherein themagnetic driving module includes a core and a coil, the core couplinginto the connecting portion of the carrier in a tight-fitting manner,and the coil wounding on an outside of the connecting portion of thecarrier.
 9. The heat dissipating device as claimed in claim 3, whereinin each of the two bases, the positioning trough includes a bottomflange formed on a bottom edge of the outer surface and at least oneside flange formed on at least one side edge of the outer surface. 10.The heat dissipating device as claimed in claim 3, wherein in each ofthe two bases, the positioning trough includes a bottom flange formed ona bottom edge of the outer surface and two side flanges respectivelyformed on two opposite side edges of the outer surface.